WO2016070325A1 - Procédé de communication, station de base et dispositif terminal - Google Patents

Procédé de communication, station de base et dispositif terminal Download PDF

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Publication number
WO2016070325A1
WO2016070325A1 PCT/CN2014/090245 CN2014090245W WO2016070325A1 WO 2016070325 A1 WO2016070325 A1 WO 2016070325A1 CN 2014090245 W CN2014090245 W CN 2014090245W WO 2016070325 A1 WO2016070325 A1 WO 2016070325A1
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Prior art keywords
terminal device
access
base station
probability distribution
distribution information
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PCT/CN2014/090245
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English (en)
Chinese (zh)
Inventor
张朝阳
王献斌
张昱
张亮
张舜卿
陈雁
Original Assignee
华为技术有限公司
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Priority to CN201480079691.7A priority Critical patent/CN106465422B/zh
Priority to PCT/CN2014/090245 priority patent/WO2016070325A1/fr
Publication of WO2016070325A1 publication Critical patent/WO2016070325A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • Embodiments of the present invention relate to the field of communications, and, more particularly, to a communication method, a base station, and a terminal device.
  • Massive Access International: Massive Access
  • the large-scale access scenario has the following characteristics: 1. The number of potential access users is large and dynamic; Second, the access network has a complex structure, the topology is variable, and the channel characteristics are dynamically changed. 3.
  • the service type is complex, and different users access data. There are significant differences in volume and latency requirements.
  • the base station predetermines and allocates communication resources (such as time, frequency, code, etc.) used for communication by each terminal device, a large amount of signaling overhead is required.
  • the system needs a communication method based on the new access mechanism to reduce the signaling overhead of the system.
  • the embodiments of the present invention provide a communication method, a base station, and a terminal device, which can reduce signaling overhead of the system.
  • an embodiment of the present invention provides a communication method, including:
  • the access degree probability distribution information used by the terminal device to communicate the system state information including the total number of users, or at least one of a data volume to be transmitted, a signal to noise ratio SNR, and a quality of service QoS, and a total number of users;
  • the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is respectively sent by using the specific one or more access degrees;
  • determining the access degree probability distribution information used by the terminal device to communicate according to the system state information including:
  • the method further includes:
  • the encoding code rate of the terminal device is determined according to the system throughput requirement; the encoding code rate is sent to the terminal device, and the encoding code rate is used to indicate the encoding code rate used by the terminal device for encoding.
  • the method after receiving the data that is sent by the terminal device according to the access degree probability distribution information, the method further includes:
  • the feedback information is sent to the terminal device.
  • the sending the access degree probability distribution information to the terminal device includes:
  • the access degree probability distribution information is transmitted to the terminal device by means of broadcast.
  • an embodiment of the present invention provides a communication method, including: receiving, by a base station, access degree probability distribution information used by a terminal device for communication, where the access degree probability distribution information is used to indicate that the terminal device has a specific one or more The probability that the access degree corresponds to when the data is sent separately;
  • the data to be transmitted is respectively sent to the base station by using a specific one or more access degrees and corresponding probabilities.
  • the method before the data to be sent is sent to the base station by using a specific one or more access degrees and a corresponding probability according to the access degree probability distribution information, the method also includes:
  • the base station Receiving an encoding code rate from the base station, the encoding code rate being determined by the base station according to the system throughput requirement;
  • the coded bits are modulated to obtain a sequence of modulation symbols.
  • the information about the access degree probability distribution information is sent to the base station by using a specific one or more access degrees and corresponding probabilities.
  • Data including:
  • Determining, according to the probability distribution information of the access degree, the degree of access d, d when the data is sent is a non-negative integer
  • the d symbols are selected from the sequence of modulation symbols for linear addition, and the linearly added result is sent to the base station.
  • the specific one or more access degrees and the corresponding probability are obtained according to the access degree probability distribution information.
  • the method further includes:
  • the sending of the data to be transmitted to the base station is stopped.
  • an embodiment of the present invention provides a base station, including:
  • a determining unit configured to determine, according to system state information, an access degree probability distribution information used by the terminal device to communicate, where the system state information includes a total number of users, or at least one of a data volume to be transmitted, a signal to noise ratio SNR, and a quality of service QoS. And the total number of users;
  • a sending unit configured to send the access degree probability distribution information to the terminal device, where the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is respectively sent by using the specific one or more access degrees;
  • the receiving unit is configured to receive data that is sent by the terminal device according to the access degree probability distribution information.
  • the determining unit is specifically configured to:
  • the probability distribution information of the access degree used when the terminal device communicates is determined.
  • the determining unit is further configured to determine a coding rate of the terminal device according to the system throughput requirement
  • the sending unit is further configured to send, to the terminal device, an encoding code rate, where the encoding code rate is used to indicate an encoding code rate used by the terminal device to perform encoding.
  • the sending unit is further configured to: when the data sent by the terminal device is successfully decoded, send the feedback information to the terminal device.
  • the sending unit is specifically configured to send the access degree probability distribution information to the terminal device by using a broadcast manner.
  • an embodiment of the present invention provides a terminal device, including:
  • a receiving unit configured to receive, by the base station, access degree probability distribution information used when the terminal device communicates, where the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is sent by using the specific one or more access degrees respectively;
  • a sending unit configured to send data to be sent to the base station by using a specific one or more access degrees and a corresponding probability according to the access degree probability distribution information.
  • the terminal device further includes a coding unit and a modulation unit, where
  • the receiving unit is further configured to receive an encoding code rate from the base station, where the encoding code rate is determined by the base station according to a system throughput requirement;
  • a coding unit configured to encode the code to be transmitted as a fixed code rate to obtain a coded bit
  • a modulating unit configured to modulate the coded bits to obtain a sequence of modulation symbols.
  • the sending unit is specifically configured to:
  • Determining, according to the probability distribution information of the access degree, the degree of access d, d when the data is sent is a non-negative integer
  • the d symbols are selected from the data to be transmitted for linear addition, and the linearly added result is sent to the base station.
  • the sending unit is further configured to: when the terminal device receives the feedback information from the base station, stop sending the data to be sent to the base station.
  • the terminal device receives the access degree probability distribution information from the base station. Then, according to the access degree probability distribution information, the corresponding time-frequency resource is used to transmit data, instead of the base station allocating a fixed time-frequency resource to the terminal device. That is to say, the base station only needs to send the access degree probability distribution information to the terminal device, instead of transmitting multiple signaling signals indicating the time-frequency resources used by the terminal device for communication, thereby reducing the signaling overhead of the system.
  • FIG. 1 shows a wireless communication system to which an embodiment of the present invention is applicable.
  • FIG. 2 is a schematic flow chart of a communication method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of the evolution of external information according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a factor graph of an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a communication method according to another embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of a communication method according to another embodiment of the present invention.
  • FIG. 7 is a schematic block diagram of a base station according to an embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
  • FIG. 9 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • FIG. 10 is a schematic block diagram of a terminal device according to another embodiment of the present invention.
  • a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
  • an application running on a computing device and a computing device can be a component.
  • One or more components can reside within a process and/or execution thread, and the components can be located on one computer and/or distributed between two or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • a component may, for example, be based on signals having one or more data packets (eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems) Communicate through local and/or remote processes.
  • data packets eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems
  • the term "article of manufacture” as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or media.
  • the computer readable medium may include, but is not limited to, a magnetic storage device (for example, a hard disk, a floppy disk, or a magnetic tape), and an optical disk (for example, a CD (Compact Disk), a DVD (Digital Versatile Disk). Etc.), smart cards and flash memory devices (for example, EPROM (Erasable Programmable Read-Only Memory, Erasable programmable read-only memory), card, stick or key drive, etc.).
  • various storage media described herein can represent one or more devices and/or other machine-readable media for storing information.
  • the term "machine-readable medium” may include, but is not limited to, a wireless channel and various other mediums capable of storing, containing, and/or carrying instructions and/or data.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • General Packet Radio Service English: General Packet Radio Service, GPRS for short
  • LTE Long Term Evolution
  • LTE frequency division duplex English: Frequency Division Duplex, FDD for short
  • LTE time division duplex English: Time Division Duplex, TDD for short
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the terminal device may be referred to as a user equipment (English: User Equipment, UE for short), and may also be called a terminal (Terminal) or a mobile station (English: Mobile Station, referred to as MS) ), mobile terminal (Mobile Terminal), etc.
  • the terminal device may be a device that accesses the communication network, such as a sensor node, a car, or the like, or a device on which the communication network can be connected for communication.
  • the terminal device can communicate with one or more core networks via a radio access network (English: Radio Access Network, RAN for short), for example, the terminal device can be a mobile phone (or "cellular" phone), with mobile Terminal computer, etc.
  • the terminal device can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with the wireless access network.
  • the base station may be a base station in GSM or CDMA (English: Base Transceiver Station, BTS for short), or may be a base station in WCDMA (English: NodeB, NB for short), or may be in LTE.
  • the evolved base station (English: Evolutional Node B, referred to as: ENB or e-NodeB), the present invention is not limited.
  • FIG. 1 shows a wireless communication system to which an embodiment of the present invention is applicable.
  • the wireless communication system 100 includes a base station 102 that can include multiple antenna groups.
  • Each antenna group may include one or more antennas, for example, one antenna group may include antennas 104 and 106, and another antenna group may include an antenna. 108 and 110, the additional set may include antennas 112 and 114.
  • Two antennas are shown in Figure 1 for each antenna group, although more or fewer antennas may be used for each group.
  • Base station 102 can additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which can include multiple components associated with signal transmission and reception (e.g., processor, modulator, multiplexer, demodulation) , demultiplexer or antenna, etc.).
  • Base station 102 can communicate with one or more terminal devices, such as access terminal 116 and access terminal 122. However, it will be appreciated that base station 102 can communicate with any number of access terminals similar to access terminal 116 or 122. Access terminals 116 and 122 can be, for example, cellular telephones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other for communicating over wireless communication system 100. Suitable for equipment. As shown, access terminal 116 is in communication with antennas 112 and 114, with antennas 112 and 114 transmitting information to access terminal 116 over forward link 118 and receiving information from access terminal 116 over reverse link 120.
  • access terminal 122 is in communication with antennas 104 and 106, wherein antennas 104 and 106 transmit information to access terminal 122 over forward link 124 and receive information from access terminal 122 over reverse link 126.
  • FDD Frequency Division Duplex
  • the forward link 118 can utilize a different frequency band than that used by the reverse link 120, and the forward link 124 can utilize the reverse link 126. Different frequency bands used.
  • the forward link 118 and the reverse link 120 can use a common frequency band, and the forward link 124 and the reverse link 126 can use a common frequency band.
  • Each set of antennas and/or regions designed for communication is referred to as a sector of base station 102.
  • the antenna group can be designed to communicate with access terminals in sectors of the coverage area of base station 102.
  • the transmit antenna of base station 102 may utilize beamforming to improve the signal to noise ratio of forward links 118 and 124.
  • the base station 102 uses beamforming to transmit signals to the randomly dispersed access terminals 116 and 122 in the relevant coverage area, the base station 102 uses a single antenna to transmit signals to all of its access terminals. Mobile devices are subject to less interference.
  • base station 102, access terminal 116 or access terminal 122 may be a wireless communication transmitting device and/or a wireless communication receiving device.
  • the wireless communication transmitting device can encode the data for transmission.
  • the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device.
  • Such data bits can be included in the transport block of data (or multiple In a transport block, a transport block can be segmented to produce a plurality of code blocks.
  • the wireless communication transmitting apparatus may encode each code block using an encoder (not shown).
  • wireless communication system 100 in FIG. 1 is only an example, and the communication system to which the embodiment of the present invention is applicable is not limited thereto.
  • the number of terminal devices e.g., access terminal 116 or access terminal 122
  • the base station predetermines and allocates communication resources (such as time, frequency, code, etc.) used by each terminal device for communication, a large amount of signaling overhead is required.
  • the embodiment of the invention provides a communication method, which can reduce the signaling overhead of the system.
  • the communication method of the embodiment of the present invention will be described in detail below. It should be noted that these examples are only intended to assist those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention.
  • FIG. 2 is a schematic flow chart of a communication method according to an embodiment of the present invention.
  • the method of Figure 2 can be performed by a base station, such as base station 102 shown in Figure 1 .
  • the 201 Determine, according to the system state information, the access degree probability distribution information used by the terminal device to communicate, where the system state information includes the total number of users, or the amount of data to be transmitted, and a signal to noise ratio (English: Signal to Noise Ratio, SNR for short) And at least one of the quality of service (English: Quality of Service, QoS for short) and the total number of users.
  • the system state information includes the total number of users, or the amount of data to be transmitted, and a signal to noise ratio (English: Signal to Noise Ratio, SNR for short) And at least one of the quality of service (English: Quality of Service, QoS for short) and the total number of users.
  • the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is separately sent by using the specific one or more access degrees.
  • the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities.
  • the terminal device transmits data to the base station according to the specified specific access degree and the corresponding probability.
  • the access degree probability distribution information may be expressed in the form of a table, or may be represented by a function expression, which is not limited by the embodiment of the present invention.
  • the access degree distribution function Where d is the access degree, p d is the corresponding probability, and N is the length of the coded bit.
  • the terminal device receives the access degree probability distribution information from the base station. Then, according to the access degree probability distribution information, the corresponding time-frequency resource is used to transmit data, instead of the base station allocating a fixed time-frequency resource to the terminal device. That is to say, the base station only needs to send the access degree probability distribution information to the terminal device instead of sending multiple signaling indications.
  • the base station since the base station is not required to allocate communication resources for each terminal device in advance.
  • the probability corresponding to one or more access degrees in the access degree probability distribution information needs to be adjusted, and the system design is simple and the system efficiency is high.
  • the target average access degree of the terminal device when determining, according to the system state information, the access degree probability distribution information used by the terminal device to communicate, may be determined according to the system state information. Then, according to the target average access degree, the access degree probability distribution information used when the terminal device communicates is determined.
  • the base station may determine the average access degree of the terminal device according to the total number of users in the system state information. Assuming that the amount of data sent by each terminal device is the same, the system load threshold can be divided by the total number of users, and the quotient value is used as the target average access degree.
  • the base station may adjust the foregoing quotient as the final target average access degree by using the foregoing quotient as a reference, combining at least one of the amount of data to be transmitted, the signal to noise ratio SNR, and the quality of service. In this way, the base station can determine the probability distribution information of the access degree used when the terminal device communicates according to the foregoing various information, thereby further improving system performance.
  • the quotient value is increased as the target average access degree; or when the QoS requirement is high, the quotient value is reduced as the target average access degree.
  • the base station can determine the access degree probability distribution information of the terminal device according to the target average access degree.
  • the M access degrees included in the access degree probability distribution information and the corresponding probability thereof satisfy the following two conditions:
  • the foregoing method for determining the access degree probability distribution information is exemplified. It should be understood that the scope of protection of the embodiments of the present invention is not limited thereto. Assuming that the target average access degree is 3, the following two types of information can be used as the access degree probability distribution information in the embodiment of the present invention:
  • the first type of information includes four access degrees 0, 2, 4, and 6, and the corresponding probabilities are 0.3, 0.2, 0.2, and 0.3, respectively;
  • the second type of information includes an access degree of 3, and the corresponding probability is 1.
  • the second information may be selected as the access degree probability distribution information.
  • the first type of information may be selected as the access degree probability distribution information.
  • the access degree probability distribution information may be determined in combination with the propagation of the external information.
  • the degree of access of the time-frequency resource block increases, the convergence point of the external information increases first and then remains substantially unchanged. That is to say, under the premise of ensuring the sparseness of the factor graph, the access degree is increased, and the performance of the system is increased or remains unchanged.
  • the access probability is greater than a certain threshold, the sparsity of the factor graph will decrease, and the decoding complexity of the base station will increase.
  • FIG. 3 is a schematic diagram of the evolution of external information according to an embodiment of the present invention.
  • the abscissa indicates the total access degree of the time-frequency resource block
  • the ordinate indicates the outer information convergence point.
  • the convergence point of the external information rapidly becomes saturated.
  • the convergence point of the external information is progressive performance, and the access probability corresponding to the 99% of the progressive performance convergence point is called the saturation point.
  • the access degree When the access degree is less than the saturation point, the access degree is increased, the convergence point of the external information is increased, and the system performance is increased.
  • the access probability is greater than the saturation point, the access probability is increased, and the convergence point of the external information is basically unchanged, but the complexity of the system will continue to increase.
  • the target average access degree can be determined according to the saturation point, and then the access degree probability distribution information is determined according to the target average access degree, thereby ensuring system capacity and low decoding complexity.
  • the base station may further determine an encoding code rate of the terminal device according to the system throughput requirement. Then, the encoding code rate is sent to the terminal device, and the encoding code rate is used to indicate the encoding code rate used when the terminal device performs encoding.
  • the base station maximizes the throughput by optimizing the optimal LDPC code rate and then transmits the LDPC code rate to the terminal device.
  • the terminal device performs LDPC encoding based on the code rate.
  • the mechanism does not need to specifically design a signature matrix, and can achieve similar performance to SCMA.
  • the feedback information is sent to the terminal device.
  • the base station after the base station can correctly decode the data sent by the terminal device, that is, after the base station successfully decodes the data sent by the terminal device, the base station sends the feedback information to the terminal device.
  • the feedback letter The information can be confirmation information. In this way, after receiving the feedback information, the terminal device can stop the transmission of the data.
  • the base station uses an iterative algorithm for decoding. Specifically, the base station can perform iterative decoding based on the Factor Graph shown in FIG. 4, thereby recovering data of each user.
  • the base station receives the demodulation and obtains demodulation information corresponding to each time-frequency resource block. Assuming that there are data transmitted by m UEs on the time-frequency resource block, the base station can form a unified Tanner graph according to the linear additive relationship of the m user access processes, the linear superposition relationship of the channels, and the verification relationship of the encoder. (a type of factor graph).
  • the Tanner graph includes three types of nodes, a Low Density Parity Check Code (English: Low Density Parity Check Code, LDPC) check node (C_node), an LDPC variable node (V_node), and a resource block node ( RB_node).
  • LDPC Low Density Parity Check Code
  • C_node Low Density Parity Check Code
  • V_node LDPC variable node
  • RB_node resource block node
  • L(c ji ) denote the soft information output from the node j of the C_node to the variable node i
  • L(q ij ) is the soft information that the variable node i outputs to the other node j.
  • V j denotes a set of all variable nodes connected to the check node j.
  • V_node LLR Update the relationship of V_node LLR as shown in formula (5):
  • h i,t is the channel gain
  • g i,t is the weight selected by the user, n t ⁇ N(0, ⁇ 2 ).
  • L(r ti ) be the LLR value of the node i of the RB_node outputting the node i of the V_node.
  • the update relationship is as follows:
  • a user signal iterative decoding recovery algorithm can be constructed.
  • the base station continuously receives the aliased data packets sent by multiple terminal devices, and runs an iterative decoding algorithm for multi-user detection and data recovery. After decoding the data sent by a terminal device successfully, the sequence corresponding to the terminal device is eliminated in the Tanner graph, and an acknowledgement ACK signal is sent to the terminal device to stop the terminal device from transmitting.
  • the random access of the terminal device naturally forms a distributed rate-free code
  • the base station only needs to perform iterative decoding based on a Tanner graph, and the number of iterations is reduced, thereby reducing the translation of the system. Code complexity.
  • the access degree probability distribution information when the access degree probability distribution information is sent to the terminal device, the access degree probability distribution information is sent to the terminal device by using a broadcast manner.
  • the base station assumes the same access degree probability distribution information used by each user, and transmits the access degree probability distribution information to each terminal device in a broadcast manner.
  • FIG. 5 is a schematic flowchart of a communication method according to another embodiment of the present invention.
  • the method of FIG. 5 can be performed by a terminal device, such as access terminal 116 or access terminal 122 shown in FIG.
  • the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities.
  • the terminal device transmits data to the base station according to the specified specific access degree and the corresponding probability.
  • the access degree probability distribution information may be expressed in the form of a table, or may be represented by a function expression, which is not limited by the embodiment of the present invention.
  • the access degree distribution function Where d is the access degree, p d is the corresponding probability, and N is the length of the coded bit.
  • the access degree probability distribution information includes three access degrees d 1 , d 2 , and d 3 , and the corresponding probabilities are p 1 , p 2 , and p 3 , respectively .
  • p 1 + p 2 + p 3 1.
  • the terminal device transmits data to the base station by using the three access degrees d 1 , d 2 , and d 3 respectively , and the number of times the data is transmitted by each access degree is determined according to the corresponding probability.
  • the terminal device receives the access degree probability distribution information from the base station. Then, according to the access degree probability distribution information, the corresponding time-frequency resource is used to transmit data, instead of the base station allocating a fixed time-frequency resource to the terminal device. That is to say, the base station only needs to send the access degree probability distribution information to the terminal device, instead of transmitting multiple signaling signals indicating the time-frequency resources used by the terminal device for communication, thereby reducing the signaling overhead of the system.
  • the base station since the base station is not required to allocate communication resources for each terminal device in advance.
  • the probability corresponding to one or more access degrees in the access degree probability distribution information needs to be adjusted, and the system design is simple and the system efficiency is high.
  • the coded rate is received from the base station, and the code is encoded.
  • the code rate is determined by the base station based on system throughput requirements.
  • the coded rate is used as a fixed code rate, and the data to be transmitted is encoded to obtain coded bits.
  • right The coded bits are modulated to obtain a sequence of modulation symbols.
  • the base station maximizes the throughput by optimizing the optimal LDPC code rate and then transmits the LDPC code rate to the terminal device.
  • the terminal device performs LDPC encoding based on the code rate.
  • the mechanism does not need to specifically design a signature matrix, and can achieve similar performance to SCMA.
  • the terminal device may obtain the probability according to the access degree.
  • the distribution information determines the access degree d, d when the data is transmitted this time is a non-negative integer. Then, d symbols are selected from the sequence of modulation symbols for linear addition, and the result of linear addition is sent to the base station.
  • the random access of the terminal device naturally forms a distributed rateless code, and the system can adaptively approach the channel capacity.
  • linear addition includes both direct addition and weighted addition. If the terminal device uses the weighted addition method, the weight map can be used to influence the Tanner graph described above, so that the Tanner graph is more sparse, thereby accelerating the convergence of the iterative decoding.
  • the terminal device uses LDPC to encode data to obtain coded bits.
  • the coded bits are then symbol mapped to obtain a series of modulation symbols.
  • the terminal device determines the access degree d when the data is transmitted this time according to the access degree probability distribution information.
  • d symbols are selected from the aforementioned modulation symbols for linear addition.
  • the linearly added symbols are transmitted to the base station through the time-frequency resources occupied by the system.
  • the terminal device repeats the aforementioned process of determining the access degree and transmitting a modulation symbol of a corresponding length until the data transmission is completed.
  • the information to be sent is sent to the base station by using a specific one or more access degrees and a corresponding probability according to the access degree probability distribution information, when the feedback information is received from the base station, Stop sending data to be sent to the base station.
  • the base station after the base station can correctly decode the data sent by the terminal device, that is, after the base station successfully decodes the data sent by the terminal device, the base station sends the feedback information to the terminal device.
  • the feedback information may be confirmation information.
  • the terminal device after receiving the feedback information, the terminal device can stop the transmission of the data.
  • FIG. 6 is a schematic flowchart of a communication method according to another embodiment of the present invention.
  • the communication method of the embodiment of the present invention is further described below with reference to FIG. It should be noted that these examples are only intended to assist those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention.
  • UE 1, UE 2, ..., UE M accesses the base station for communication.
  • the data to be sent of UE 1 is The length is K 1 bit, which is input to the encoder for encoding to obtain coded bits. Performing symbol mapping on coded bits to obtain a series of modulation symbols
  • the degree generator determines the degree d 1 of the current transmission based on the access degree probability distribution information received from the access degree probability distribution controller on the base station side.
  • Data selector MUX from modulation symbol The d 1 symbols are input to the adder, linearly added, and finally transmitted to the channel time-frequency resource block.
  • UE 1 repeats the foregoing process until the aforementioned data to be transmitted is successfully transmitted.
  • the data to be sent of UE M is The length is K M bits, and the input is encoded to encode to obtain coded bits.
  • the coded bits are symbol mapped to obtain a series of modulation symbols.
  • the length is N M bits.
  • the degree generator determines the degree of transmission d M , the data selector MUX from the modulation symbol according to the access degree probability distribution information received from the access degree probability distribution controller of the base station side
  • the d M symbols are selected and input to the adder, and are linearly added, and finally transmitted to the channel time-frequency resource block.
  • UE M repeats the foregoing process until the aforementioned modulation symbols are successfully transmitted
  • the access degree probability distribution controller of the base station determines the access degree probability distribution information, and transmits the corresponding access degree probability distribution information to the degree generators of the respective UEs.
  • the base station demodulates the data received from the UE, and obtains demodulation information corresponding to each time-frequency resource block. Then, according to the check relationship of the encoder, the linear addition relationship of each UE access process, and the linear superposition relationship of the channels, a unified factor graph (eg, Tanner graph) is constructed, and the multi-user is iterated on the factor graph. Detection decoding.
  • the base station successfully decodes a message of one UE, it sends an acknowledgement message to the UE. At the same time, the current receiving sequence of the user is eliminated from the factor graph. In this way, the base station performs iterative decoding based on a factor graph, which does not require complicated multi-user detection and SISO decoder iterative process, thereby reducing decoding complexity.
  • FIG. 7 is a schematic block diagram of a base station according to an embodiment of the present invention.
  • the base station in FIG. 7 includes a determining unit 701, a transmitting unit 702, and a receiving unit 703.
  • the determining unit 701 is configured to determine, according to the system state information, the access degree probability distribution information used by the terminal device to communicate, where the system state information includes the total number of users, or the amount of data to be transmitted, the signal to noise ratio SNR, and the quality of service QoS. One and the total number of users.
  • the sending unit 702 is configured to send the access degree probability distribution information to the terminal device, where the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is separately transmitted by using the specific one or more access degrees.
  • the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities.
  • the terminal device transmits data to the base station according to the specified specific access degree and the corresponding probability.
  • the access degree probability distribution information may be expressed in the form of a table, or may be represented by a function expression, which is not limited by the embodiment of the present invention.
  • the access degree distribution function Where d is the access degree, p d is the corresponding probability, and N is the length of the coded bit.
  • the receiving unit 703 is configured to receive data that is sent by the terminal device according to the access degree probability distribution information.
  • the terminal device receives the access degree probability distribution information from the base station. Then, according to the access degree probability distribution information, the corresponding time-frequency resource is used to transmit data, instead of the base station allocating a fixed time-frequency resource to the terminal device. That is to say, the base station only needs to send the access degree probability distribution information to the terminal device, instead of transmitting multiple signaling signals indicating the time-frequency resources used by the terminal device for communication, thereby reducing the signaling overhead of the system.
  • the base station since the base station is not required to allocate communication resources for each terminal device in advance.
  • the probability corresponding to one or more access degrees in the access degree probability distribution information needs to be adjusted, and the system design is simple and the system efficiency is high.
  • the determining unit 701 is specifically configured to determine, according to the system state information, a target average access degree of the terminal device. Then, according to the target average access degree, the access degree probability distribution information used when the terminal device communicates is determined.
  • the base station may determine the average access degree of the terminal device according to the total number of users in the system state information. Assuming that the amount of data sent by each terminal device is the same, the system load threshold can be divided by the total number of users, and the quotient value is used as the target average access degree.
  • the base station may adjust the foregoing quotient as the final target average access degree by using the foregoing quotient as a reference, combining at least one of the amount of data to be transmitted, the signal to noise ratio SNR, and the quality of service. In this way, the base station can determine the probability distribution information of the access degree used when the terminal device communicates according to the foregoing various information, thereby further improving system performance.
  • the quotient value is increased as the target average access degree; or when the QoS requirement is high, the quotient value is reduced as the target average access degree.
  • the base station can determine the access degree probability of the terminal device according to the target average access degree Distribution information.
  • the M access degrees included in the access degree probability distribution information and the corresponding probability thereof satisfy the following two conditions:
  • the foregoing method for determining the access degree probability distribution information is exemplified. It should be understood that the scope of protection of the embodiments of the present invention is not limited thereto. Assuming that the target average access degree is 3, the following two types of information can be used as the access degree probability distribution information in the embodiment of the present invention:
  • the first type of information includes four access degrees 0, 2, 4, and 6, and the corresponding probabilities are 0.3, 0.2, 0.2, and 0.3, respectively;
  • the second type of information includes an access degree of 3, and the corresponding probability is 1.
  • the second information may be selected as the access degree probability distribution information.
  • the first type of information may be selected as the access degree probability distribution information.
  • the access degree probability distribution information may be determined in combination with the propagation of the external information.
  • the degree of access of the time-frequency resource block increases, the convergence point of the external information increases first and then remains substantially unchanged. That is to say, under the premise of ensuring the sparseness of the factor graph, the access degree is increased, and the performance of the system is increased or remains unchanged.
  • the access probability is greater than a certain threshold, the sparsity of the factor graph will decrease, and the decoding complexity of the base station will increase.
  • FIG. 3 is a schematic diagram of the evolution of external information according to an embodiment of the present invention.
  • the abscissa indicates the total access degree of the time-frequency resource block
  • the ordinate indicates the outer information convergence point.
  • the convergence point of the external information rapidly becomes saturated.
  • the convergence point of the external information is progressive performance, and the access probability corresponding to the 99% of the progressive performance convergence point is called the saturation point.
  • the access degree When the access degree is less than the saturation point, the access degree is increased, the convergence point of the external information is increased, and the system performance is increased.
  • the access probability is greater than the saturation point, the access probability is increased, and the convergence point of the external information is basically unchanged, but the complexity of the system will continue to increase.
  • the target average access degree can be determined according to the saturation point, and then the access degree probability distribution information is determined according to the target average access degree, thereby ensuring system capacity and low decoding complexity.
  • the determining unit 701 is further configured to use, according to a system throughput requirement, Determine the code rate of the terminal device.
  • the sending unit 702 is further configured to send, to the terminal device, an encoding code rate, where the encoding code rate is used to indicate an encoding code rate used by the terminal device to perform encoding.
  • the base station maximizes the throughput by optimizing the optimal LDPC code rate and then transmits the LDPC code rate to the terminal device.
  • the terminal device performs LDPC encoding based on the code rate.
  • the mechanism does not need to specifically design a signature matrix, and can achieve similar performance to SCMA.
  • the sending unit 702 is further configured to: when the data sent by the terminal device is successfully decoded, send the feedback information to the terminal device.
  • the base station after the base station can correctly decode the data sent by the terminal device, that is, after the base station successfully decodes the data sent by the terminal device, the base station sends the feedback information to the terminal device.
  • the feedback information may be confirmation information.
  • the terminal device after receiving the feedback information, the terminal device can stop the transmission of the data.
  • the sending unit 702 is specifically configured to send the access degree probability distribution information to the terminal device by using a broadcast manner.
  • the base station assumes the same access degree probability distribution information used by each user, and transmits the access degree probability distribution information to each terminal device in a broadcast manner.
  • FIG. 8 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
  • the terminal device in FIG. 8 includes a receiving unit 801 and a transmitting unit 802.
  • the receiving unit 801 is configured to receive, by the base station, the access degree probability distribution information used when the terminal device communicates, where the access degree probability distribution information is used to indicate a probability corresponding to the terminal device transmitting the data by using the specific one or more access degrees respectively. .
  • the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities.
  • the terminal device transmits data to the base station according to the specified specific access degree and the corresponding probability.
  • the access degree probability distribution information may be expressed in the form of a table, or may be represented by a function expression, which is not limited by the embodiment of the present invention.
  • the access degree distribution function Where d is the access degree, p d is the corresponding probability, and N is the length of the coded bit.
  • the sending unit 802 is configured to send, to the base station, the data to be sent, respectively, according to the access degree probability distribution information, with a specific one or more access degrees and a corresponding probability.
  • the access degree probability distribution information includes three access degrees d 1 , d 2 , and d 3 , and the corresponding probabilities are p 1 , p 2 , and p 3 , respectively .
  • p 1 + p 2 + p 3 1.
  • the terminal device transmits data to the base station by using the three access degrees d 1 , d 2 , and d 3 respectively , and the number of times the data is transmitted by each access degree is determined according to the corresponding probability.
  • the terminal device receives the access degree probability distribution information from the base station. Then, according to the access degree probability distribution information, the corresponding time-frequency resource is used to transmit data, instead of the base station allocating a fixed time-frequency resource to the terminal device. That is to say, the base station only needs to send the access degree probability distribution information to the terminal device, instead of transmitting multiple signaling signals indicating the time-frequency resources used by the terminal device for communication, thereby reducing the signaling overhead of the system.
  • the base station since the base station is not required to allocate communication resources for each terminal device in advance.
  • the probability corresponding to one or more access degrees in the access degree probability distribution information needs to be adjusted, and the system design is simple and the system efficiency is high.
  • the terminal device further includes an encoding unit 803 and a modulation unit 804.
  • the receiving unit 801 is further configured to receive an encoding code rate from the base station, where the encoding code rate is determined by the base station according to a system throughput requirement.
  • the encoding unit 803 is configured to encode the data to be transmitted as the fixed code rate as the fixed code rate to obtain coded bits.
  • a modulating unit configured to modulate the coded bits to obtain a sequence of modulation symbols.
  • the base station maximizes the throughput by optimizing the optimal LDPC code rate and then transmits the LDPC code rate to the terminal device.
  • the terminal device performs LDPC encoding based on the code rate.
  • the mechanism does not need to specifically design a signature matrix, and can achieve similar performance to SCMA.
  • the sending unit 802 is specifically configured to determine, according to the access degree probability distribution information, the access degree d, d when the data is sent this time is a non-negative integer. Then, d symbols are selected from the sequence of modulation symbols for linear addition, and the result of linear addition is sent to the base station.
  • linear addition includes both direct addition and weighted addition. If the terminal device uses the weighted addition method, the weight can be used to influence the Tanner graph described above. The Tanner graph is made more sparse, which accelerates the convergence of iterative decoding.
  • the terminal device uses LDPC to encode data to obtain coded bits.
  • the coded bits are then symbol mapped to obtain a series of modulation symbols.
  • the terminal device determines the access degree d when the data is transmitted this time according to the access degree probability distribution information.
  • d symbols are selected from the aforementioned modulation symbols for linear addition.
  • the linearly added symbols are transmitted to the base station through the time-frequency resources occupied by the system.
  • the terminal device repeats the aforementioned process of determining the access degree and transmitting a modulation symbol of a corresponding length until the data transmission is completed.
  • the sending unit 802 is further configured to stop sending data to be sent to the base station when the terminal device receives the feedback information from the base station.
  • the base station after the base station can correctly decode the data sent by the terminal device, that is, after the base station successfully decodes the data sent by the terminal device, the base station sends the feedback information to the terminal device.
  • the feedback information may be confirmation information.
  • the terminal device after receiving the feedback information, the terminal device can stop the transmission of the data.
  • FIG. 9 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • base station 90 of FIG. 9 can be used to implement the steps and methods in the foregoing method embodiments.
  • base station 90 includes an antenna 901, a transmitter 902, a receiver 903, a processor 904, and a memory 905.
  • Processor 904 controls the operation of base station 90 and can be used to process signals.
  • Memory 905 can include read only memory and random access memory and provides instructions and data to processor 904.
  • Transmitter 902 and receiver 903 can be coupled to antenna 901.
  • the various components of base station 90 are coupled together by a bus system 909, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 909 in the figure.
  • base station 90 can be base station 102 shown in FIG.
  • the memory 905 can store instructions to perform the following process:
  • the access degree probability distribution information used by the terminal device to communicate the system state information including the total number of users, or at least one of a data volume to be transmitted, a signal to noise ratio SNR, and a quality of service QoS, and a total number of users;
  • the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is respectively sent by using the specific one or more access degrees;
  • the terminal device receives the access degree probability distribution information from the base station. Then, according to the access degree probability distribution information, occupy corresponding time-frequency resources Instead of transmitting a fixed time-frequency resource to the terminal device by the base station, the data is transmitted. That is to say, the base station only needs to send the access degree probability distribution information to the terminal device, instead of transmitting multiple signaling signals indicating the time-frequency resources used by the terminal device for communication, thereby reducing the signaling overhead of the system.
  • the base station since the base station is not required to allocate communication resources for each terminal device in advance.
  • the probability corresponding to one or more access degrees in the access degree probability distribution information needs to be adjusted, and the system design is simple and the system efficiency is high.
  • the memory 905 may also store instructions to perform the following process:
  • Determining the access degree probability distribution information used by the terminal device according to the system status information determining the target average access degree of the terminal device according to the system status information; determining the connection used by the terminal device according to the target average access degree Into the probability distribution information.
  • the memory 905 may also store instructions to perform the following process:
  • the encoding code rate of the terminal device is determined according to the system throughput requirement; the encoding code rate is sent to the terminal device, and the encoding code rate is used to indicate the encoding code rate used by the terminal device for encoding.
  • the memory 905 may also store instructions to perform the following process:
  • the feedback information is sent to the terminal device.
  • the memory 905 may also store instructions to perform the following process:
  • the access degree probability distribution information is transmitted to the terminal device.
  • the access degree probability distribution information is transmitted to the terminal device by means of broadcast.
  • FIG. 10 is a schematic block diagram of a terminal device according to another embodiment of the present invention.
  • the terminal device 100 of FIG. 10 can be used to implement the steps and methods in the foregoing method embodiments.
  • the terminal device 100 includes an antenna 1001, a transmitter 1002, a receiver 1003, a processor 1004, and a memory 1005.
  • the processor 1004 controls the operation of the terminal device 100 and can be used to process signals.
  • Memory 1005 can include read only memory and random access memory and provides instructions and data to processor 1004.
  • Transmitter 1002 and receiver 1003 can be coupled to antenna 1001.
  • the various components of terminal device 100 are coupled together by a bus system 1009, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1009 in the figure.
  • the terminal device 100 can be the access terminal 116 or the access terminal 122 shown in FIG.
  • the memory 1005 can store instructions to perform the following process:
  • the data to be transmitted is respectively sent to the base station by using a specific one or more access degrees and corresponding probabilities.
  • the terminal device receives the access degree probability distribution information from the base station. Then, according to the access degree probability distribution information, the corresponding time-frequency resource is used to transmit data, instead of the base station allocating a fixed time-frequency resource to the terminal device. That is to say, the base station only needs to send the access degree probability distribution information to the terminal device, instead of transmitting multiple signaling signals indicating the time-frequency resources used by the terminal device for communication, thereby reducing the signaling overhead of the system.
  • the base station since the base station is not required to allocate communication resources for each terminal device in advance.
  • the probability corresponding to one or more access degrees in the access degree probability distribution information needs to be adjusted, and the system design is simple and the system efficiency is high.
  • the memory 1005 may also store instructions to perform the following process:
  • the base station Receiving an encoding code rate from the base station, the encoding code rate being determined by the base station according to the system throughput requirement;
  • the coded bits are modulated to obtain a sequence of modulation symbols.
  • the memory 1005 may also store instructions to perform the following process:
  • the access degree when the data to be transmitted is respectively sent to the base station by using the specific one or more access degrees and the corresponding probability, the access degree when the data is transmitted is determined according to the access degree probability distribution information.
  • d is a non-negative integer; d symbols are selected from the sequence of modulation symbols for linear addition, and the result of linear addition is sent to the base station.
  • the memory 1005 may also store instructions to perform the following process:
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, and a read only memory (English: Read-Only Memory (ROM), Random Access Memory (English: Random Access Memory, RAM), disk or optical disk, and other media that can store program code.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de communication, une station de base et un dispositif terminal. Le procédé consiste à : déterminer, selon des informations d'état d'un système, des informations de distribution de probabilité de degré d'accès utilisées lorsqu'un dispositif terminal mène une communication, les informations d'état du système comprenant le nombre total d'utilisateurs ou comprenant une quantité de données à transmettre et/ou un rapport signal sur bruit (SNR) et/ou une qualité de service (QoS) et/ou le nombre total d'utilisateurs; envoyer les informations de distribution de probabilité de degré d'accès au dispositif terminal, les informations de distribution de probabilité de degré d'accès servant à indiquer une ou des probabilités correspondantes lorsque le dispositif terminal envoie séparément des données à l'aide d'un ou de plusieurs degrés d'accès spécifiques; et recevoir des données envoyées par le dispositif terminal selon les informations de distribution de probabilité de degré d'accès. Des modes de réalisation de la présente invention peuvent réduire des surdébits de signalisation d'un système.
PCT/CN2014/090245 2014-11-04 2014-11-04 Procédé de communication, station de base et dispositif terminal WO2016070325A1 (fr)

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CN101695016B (zh) * 2009-10-22 2013-07-10 浙江大学 基于无速率码的多用户随机接入***及其编译码方法
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